package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.entity.User;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import io.swagger.models.auth.In;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {


    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;


    /**
     * 统计指定时间区间内的营业额
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从开始到结束每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            //日期计算，计算指定日期的后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date日期对应的营业额数据，营业额是指：状态为已完成的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //select sum(amount) from orders where order_time > beginTime and order_time < endTime and status = 5
            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED) ;
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }




    /**
     * 统计指定时间区间内永固数据
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //存放从开始到结束日期间每天对应日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }


        //每日用户新增量 select count(id) from user where create_time < ? and creat_time > ?
        List<Integer> newUserList = new ArrayList<>();
        //每日用户总数量  select count(id) from user where create_time < ?
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();

            map.put("end",endTime);
            //总用户数量
            totalUserList.add(userMapper.countByMap(map));
            map.put("begin",beginTime);
            //新增用户数量
            newUserList.add(userMapper.countByMap(map));
        }


        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();
    }

    /**
     * 统计指定时间内的订单数据
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        //存放从开始到结束日期间每天对应日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        //遍历dateList集合查询每天有效订单数和订单总数
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //查询每天订单总数 select count(id) from orders where order_time > ? and order_time < ?
            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            Integer orderCount = orderMapper.countByMap(map);
            //查询每天有效订单数 select count(id) from orders where order_time > ? and order_time < ? and status = 5
            map.put("status", Orders.COMPLETED) ;
            Integer validOrderCount =  orderMapper.countByMap(map);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //计算时间区间内订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //计算时间区间内有效订单总数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue()/totalOrderCount;
        }


        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .orderCompletionRate(orderCompletionRate)
                .validOrderCount(validOrderCount)
                .totalOrderCount(totalOrderCount)
                .build();
    }


    /**
     * 统计指定时间内的销量排名前十的套餐或菜品
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO geTop10OrdersStatistics(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        //数据处理
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        return new SalesTop10ReportVO(nameList,numberList);
    }


    /**
     * 导出运营数据报表
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        //查询数据库获取营业数据---查询最近三十天的运营数据（）
        LocalDate begin = LocalDate.now().minusDays(30);
        LocalDate end = LocalDate.now().minusDays(1);
        
        //查询概览数据
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(begin, LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));
        
        //通过POI将数据写入excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            //基于模板文件创建一个新的excel
            XSSFWorkbook excels = new XSSFWorkbook(in);

            //通过sheet名字获得表格文件sheet页
            XSSFSheet sheet = excels.getSheet("Sheet1");

            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间"+begin+"至"+end);

            //获得第四行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());
            //获得第五行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());

            //填充明细数据
            for (int i = 0 ; i < 30 ; i++){
                LocalDate date = begin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData1 = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                //获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData1.getTurnover());
                row.getCell(3).setCellValue(businessData1.getValidOrderCount());
                row.getCell(4).setCellValue(businessData1.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData1.getUnitPrice());
                row.getCell(6).setCellValue(businessData1.getNewUsers());
            }


            //通过输出流将excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excels.write(out);

            //关闭资源
            out.close();
            excels.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
